Real Estate and Intangible Assets - Portfolio Diversification (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) a farm region	Dec. 31, 2018 USD ($) a farm
Real Estate Properties [Line Items]
Number of Farms | farm	111	85
Total Acres | a	86,535	73,205
Percent of Total Acres	100.00%	100.00%
Lease Revenue	$ 40,692
Lease Revenue		$ 29,362
Percent of Total lease revenue	100.00%	100.00%
California
Real Estate Properties [Line Items]
Number of Farms | farm	42	33
Total Acres | a	14,830	10,147
Percent of Total Acres	17.10%	13.80%
Lease Revenue	$ 21,701
Lease Revenue		$ 13,672
Percent of Total lease revenue	53.30%	46.60%
Number of regions farms are located | region	6
Florida
Real Estate Properties [Line Items]
Number of Farms | farm	23	22
Total Acres | a	20,770	17,184
Percent of Total Acres	24.00%	23.50%
Lease Revenue	$ 11,115
Lease Revenue		$ 8,133
Percent of Total lease revenue	27.30%	27.70%
Colorado
Real Estate Properties [Line Items]
Number of Farms | farm	10	10
Total Acres | a	31,448	31,448
Percent of Total Acres	36.30%	42.90%
Lease Revenue	$ 2,857
Lease Revenue		$ 2,743
Percent of Total lease revenue	7.00%	9.30%
Arizona
Real Estate Properties [Line Items]
Number of Farms | farm	6	6
Total Acres | a	6,280	6,280
Percent of Total Acres	7.30%	8.60%
Lease Revenue	$ 2,219
Lease Revenue		$ 2,045
Percent of Total lease revenue	5.50%	7.00%
Nebraska
Real Estate Properties [Line Items]
Number of Farms | farm	8	2
Total Acres | a	7,104	2,559
Percent of Total Acres	8.20%	3.50%
Lease Revenue	$ 665
Lease Revenue		$ 580
Percent of Total lease revenue	1.60%	2.00%
Texas
Real Estate Properties [Line Items]
Number of Farms | farm	1	1
Total Acres | a	3,667	3,667
Percent of Total Acres	4.20%	5.00%
Lease Revenue	$ 527
Lease Revenue		$ 60
Percent of Total lease revenue	1.30%	0.20%
Oregon
Real Estate Properties [Line Items]
Number of Farms | farm	3	3
Total Acres | a	418	418
Percent of Total Acres	0.50%	0.60%
Lease Revenue	$ 515
Lease Revenue		$ 893
Percent of Total lease revenue	1.30%	3.00%
Washington
Real Estate Properties [Line Items]
Number of Farms | farm	1	1
Total Acres | a	746	746
Percent of Total Acres	0.90%	1.10%
Lease Revenue	$ 506
Lease Revenue		$ 718
Percent of Total lease revenue	1.20%	2.40%
Michigan
Real Estate Properties [Line Items]
Number of Farms | farm	15	5
Total Acres | a	962	446
Percent of Total Acres	1.10%	0.60%
Lease Revenue	$ 429
Lease Revenue		$ 370
Percent of Total lease revenue	1.10%	1.30%
North Carolina
Real Estate Properties [Line Items]
Number of Farms | farm	2	2
Total Acres | a	310	310
Percent of Total Acres	0.40%	0.40%
Lease Revenue	$ 158
Lease Revenue		$ 148
Percent of Total lease revenue	0.40%	0.50%